­The system operationally provides air quality forecast at 24h and 48h for Europe (12x12 km), the Iberian Peninsula (4x4 km) Andalusia (1x1 km), Canary Islands (2x2 km), Catalonia (1x1 km) and Madrid (1x1 km) by means nesting techniques.

The forecast consists of three main parts:

1. Meteorological forecast: temperature, precipitation, humidity, pressure, cloud cover, wind direction and speed, among other.
2. Emission forecast: nitrogen oxides (NO and NO2), volatile organic compounds (VOCs), carbon monoxide (CO), sulfur dioxide (SO2) and particulate matter (PM).
3. Air quality forecast: O3, NO2, CO, SO2,  PM10, PM2.5 and benzene.

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CALIOPE System comprises the following models: 

1. Emission model: HERMESv2
2. Meteorological model: WRF-ARW v3.5.1 
3. Chemical transport model: CMAQ V5.0.2
4. Mineral dust atmospheric model: BSC-DREAM8bv2

Main CALIOPE air quality products are as follows:

• Concentration maps:
• Hourly and maximum concentration for 24 and 48 h forecast
• Corrected air quality forecast based on measurements

•  Air quality levels 
• Forecasted air quality index maps
• Forecasted air quality index at measurement locations
• Tables of maximum values of air quality, planned for 24 and 48h

• Forecast evaluation
• Near real-time evaluation at measuring stations (CCAA, municipalities, AEMET EIONET)
• Summary sheets of the annual forecast (statistical and graphics).
• Satellite Images
• Air Quality
• Weather

CALIOPE system also provides forecast for meteorology and emissions for each study. 

CALIOPE system represents the current state of knowledge on modelling issues of air quality forecast worldwide. 

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Workflow of the CALIOPE system

The system has been evaluated in a diagnostic mode, based on the year 2004, several studies published during the past four years. CALIOPE forecast mode as been evaluated on years 2009 and 2011. In addition, since 2009 the system has been evaluated continuously (NRT: Near Real Time) with hourly observations (see evaluation of the forecast).

Evaluation studies involving the CALIOPE system have been published in peer reviewed journals: 

• European Domain
• Pay et al. (2010, 2012a)
• ­Basart et al. (2012)
• Spanish Domain
• Baldasano et al. (2011)
• Pay et al.(2011, ­2012b)
• Borrego et al. (2011) 
• Sicardi et al. (2012)
• Barcelona and Madrid Domains
• Gonçalves et al. (2009)
• Cataluña Domain
• Jiménez et al. (2008)
• Aguilera et al. (2013)

The CALIOPE system setting is showing in the next table for the European (EU) and Iberian Peninsula (IP) domains, since 2007, when the forecast system started operationally.

* When the setting is different to both domains, the setting is shown for each one (emissions and Kalman filter).